Anomalous Freezing of Nano-Confined Water in Room-Temperature Ionic Liquid 1-Butyl-3-Methylimidazolium Nitrate

被引：30

作者：

Abe, Hiroshi ^{[1
]}

Takekiyo, Takahiro ^{[2
]}

Yoshimura, Yukihiro ^{[2
]}

Saihara, Koji ^{[3
]}

Shimizu, Akio ^{[3
]}

机构：

[1] Natl Def Acad, Dept Mat Sci & Engn, Yokosuka, Kanagawa 2398686, Japan

[2] Natl Def Acad, Dept Appl Chem, Yokosuka, Kanagawa 398686, Japan

[3] Soka Univ, Grad Sch Environm Engn Symbiosis, Hachioji, Tokyo 1928577, Japan

来源：

CHEMPHYSCHEM | 2016年 / 17卷 / 08期

关键词：

anomalous freezing; crystal polymorphs; nano-confined amorphous ice; nano-confinement in liquids; ionic liquids; NEUTRON-SCATTERING; PHASE-TRANSITION; METALLIC SODIUM; ICE-I; PROTEIN; PRESSURE; FUTURE; STABILITY; DYNAMICS;

D O I：

10.1002/cphc.201501199

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Non-crystal formation of ice is investigated by simultaneous X-ray diffraction and differential scanning calorimetry measurements upon cooling to -100 degrees C. At room temperature, sizetunable water confinement (approximate to 20 angstrom size) in a room-temperature ionic liquid (RTIL, 1-butyl-3-methylimidazolium nitrate, [C(4)mim][NO3]) exists in a water-rich region (70-90 mol% D2O). The confined water (water pocket) is characterized by almost monodispersive size distribution. In [C(4)mim][NO3]-xmol% D2O (70< x< 94), the absence of sharp Bragg reflections and a distinct exothermal peak indicate that crystallization/cold crystallization both of [C(4)mim][NO3] and D2O is suppressed, even upon slow cooling and heating.

引用

页码：1136 / 1142

页数：7

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